Carbureter.



A. H. BOETTCHER.

CARBUHETER. Y APPucYATfoN FILED JAN. 29, :912.

Patente Feb. 29, 1916.

.ARTHUR H. BOEITCLIER, OF

CHICAGO, ILLINOIS, ASSIGNOR TO STROMERG MOTOR DEVICES COMPANY, 0FCHICAGO, ILLINOIS, ACORPOBATION 0F ILLINOIS.

caminantes.

Specification `of Letters Patent.

iateatea ireb. as, une.

Application filed January 29, 1912. Serial No. 673,983.

To all whom t may concern.'

Be it known that I, 'ARTHUR H. Boi-:TT- CHER,V a citizen of the UnitedlStates, re-

siding at (liicagoin the county of Cook and State of Illinois.havefinvented new and useful Improvements in Carbureters, of which thefollowing is a full, clear. conoise, and exact description, referencebeing had to the accompanying drawings. forming a part'ofthisspecification.

My invention relates to charge forming devices for internal 4combustionengines and has to do with that type of carbureter designated in the artas multiple feed` the idea being to-vary Athe amount of f uel and airsupplied in, accordance with the demand made by the associated engine.This regulationis 'secured by the-use of a valve which number of theplurality of fuel supply devices provided* It .will appear that,broadly, so faras the features of myfinvention are concerned. this valvemay be operated manually or may be operated automatically by means of agoveinor connected with the engine or by means of the suction of theengine.

In the specific form of my invention herein shown and described. thevalve is operated by the suction of the engine and in `this way itsworkings are a matter of its response to the requirements of the engine.In devices of this kind it is old iii the art to provide an air inlet. aplurality of fuel jets. and a valve for 'simultaneously varyair inletand the number of open fuel jets. The valve,'in this particularinstance, is in the form of a piston, the chamber on one side of thevalve being connected with the manifold of the engine. By the movementof this valve, the space connected with the engine may be made greateror smaller, in accordance with the and simultaneously more or fewer ofthe'gasolene inlets or jets, which are properly arranged along the -lineof travel of the valve, are open to the draft of air entering thecarburetiiig chamber.v These devices have been found to be effectiveand, so far as the movement of t'he valve is concerned, sensitivelyresponsive to the demand made b v the engine. However, in the devices ofthe prior art the changes in the size of the air inlet were infinitely"Aingthe size of the ineffective another fuel inlet.

small while the amount of fuel increased step by step. That is, sincethere was a single air inlet and a plurality of fuel jets, and no arangement to overcome the difiiculty, the `amount of. air admitted couldhe increased to some. extent without correspondingly increasing theamount of fuel, since the slightest movement of the valve would vary theamount of air but a' considerable movement thereof would be required toopen or close another fuel inlet, or render The valve could move vtheentire distance between the inlets to increase the amount of airvwithout opening the next succeeding inlet.

It is the object of my invention to overcome this difficulty and toprovide` a carbu` reter of the type referred to wherein the slightestmovement of the valve to increase the amount of air would result in acorresponding'increase in the amount of fuel. Thus every part. ofthemovement of the valve, however slight, to increase the air inlet, willbe accompanied by an increase in the amount of fuel admitted, and everyinlet, when the air inlet is varied but these have not been found to besuccessful since the control is ditlicult if not impossible and therange is so limited.'

In order to secure the objects of my invention as set forth in thepreceding paragraph. I provide a special form of valve which operates topositively open and close the fuel4 jets and also to restrict some ofthem. As before stated, the valve of my invention is in the formof apiston. and the cylinder in which it operates is provided with alongitudinally extending air inlet and a longitudinal row of fuelinlets.4 The valve operates to connectmore or less of this air inletwith the carbureting chamber and also positively vand correspondinglyopens andcloses the fuel jets. In view of the fact that itis thedefinite proportion between the air andV fuel.

of the jets unintentionally. I secure this desirablefeature by means ofla simple vand -inexpensive structure and the fact that some of the fuelinlets are allowed to respond partially tothe suction of the engineavoids any tendency for the leaking-or by-passing of fuel around thevalve in response to any unbalanced vacuum. Thus, the uninten tionalpassage of fuel. which would 'upset the constituent proportions of thecombustible mixture, is prevented and only't'ho'se fuel jets which areintended to operate will respond. In this 'way the device is alwayssensitive and accurate and maintains the proper constituent proportionsof the combustible mixture Whatever be the speed of the engine. l

My invention is embodied in the 4device illustrated in the accompanyingdrawings, in which- Figure 1 is al longitudinal sectional View rta-ke onan axial plane through my device, Fig. 2.is a cross-sectional view takenon the -plane `ofthe line 4 4 of Fig. land looking in thedirectionindicated by the arrows. Like reference characters are appliedto the same parts throughout the several views.

Thev main framework ofthe carbureter.

itself is in the form of a generally .cylindrical body 10 which'providesthe carbureting chamber 11, a sensitive piston cylinder-12, and a valvepiston cylinder 13, the cylinders extending in opposite directions fromthe carbureting chamber and being' in axial alinement therewith and witheach other.

The carbureting chamber 11 has the upwardly extending outlet pipe 14which is provided with a iange 15 to facilitate its at'- tachment to thepiping which leads to the engine. A rock shaft 16 extends diametricallyacross the outlet pipe 14 and carries the throttle valve 18. The shaft16 extends beyond its bearings in the pipe 14 and isl v there providedwith an operating lever rigidly mounted thereon. If the engine with'.'which the carbureter is associated is mounted 4asa car motor, thislever is connected by means of suitable linkages 'conveniently locatedon the dash of the automobile.

The sensitive piston chamber 12,- in the specific Vembodiment hereinshown, is separated from -the carbureting chamber 11 by meansof a Wall25which'has an aperture 26 providing for pneumatic connection between thecarbureting chamber and its cylinvso alinement with the cylinders 12 and13. -A

der. The wall 25`carries an elongated boss 27'jwhichv has a longitudinalbore in axial A 'Y p rod 2'8`is mounted to .slide with a bearing .A fitin `this boss, as bestillustrated in Fig.l 1-,

`this rod'b'eing of such length that it .may-

extend into both cvlinders 12 'and 13.4 With- .0f this piston. The otherend vof the rod 2S is provided with apiston 34 which is the valvehereinbefore referredto and hereinafter; to be described specifically.In order to distinguish conveniently between the two pistons Ishallref'er tothe piston 29 as the sensitive piston and to the piston 34as the valve.` It will be understood, of course,

that the suction of the engine has some effect on the valve 34 and itwill be noted that the valve 34 and the piston 29 are of different-diameters so as to secure a differential ac tion, the diiference' inthe areas `of thetwo parts being thatwhich makes possible the effectiveoperation.

.It will b e seen from the draWngsthat the cylinder 13 is supplementedby a downwardly extending box or passage 36 which is substituted forsubstantially one-fourth of the peripheral area -of the cylinder. rlheinterior of this box connects directly with the interior of thecylinderand is exposed at thebottom directly to the atmosphere asindicated at 37l This the air inlet. v

It will be seen that, for the greater part of the periphery of the valve34, there is a suitable space between itand the inside surface of the,cylinder. Av shell or sleeve 38, as best shown in Figs. 1` and 2,occupies this space, fitting snugly within the cylinder and extendingthe entire length thereof. It will be noted that the sleeve 38. is not acomplete cylinder, but has-what may be'termed an ,opening 40 which isapproximately the same size as the opening between the box 36 and thecylinder: 13. The valve 34 is. therefore out out to accommodate thesleeve :3321s far around its periphery 'as need be,`,while the remainingpart ofthe pistonis of a vradius equal to the inside vradius of' thecylinder, as

is the outer-radius of the sleeve. The'sleeve 38'carrie's ahead 39 whichfits in a pocket valve 34 may ride in positive sliding contact upon the:top thereof. This block is substantially rectangular in shape and isdisposed directly below the axis of the cylinder 13,

' the axes of the blocklying in the same plane therewith.- The essentialfeature is at the top of the block, whereithe fuel jets are, as

will be explained, Iand this top isv tangent to the surface ofthe valve'34 orbetter than there is .considerable apertures 50,

that, slightly concave to tit the convex sur face of the valve. Theblock- 44 is mounted upon lugs 45, 45 extending inwardly from the wallof the box 36 and from the removable cover 46, held in place by thescrews 4T, 4T, which permits o ready access to the interior of the box,The box 36, as shown in Fig. 2.,-is of such size and disposition thatspace for the passage or air on both sides of the nozzle block.

Thehnozzle block is provided with a-plurality of .vertical passagevvays48, 48 and the tops of these passageway-s are restricted by means of theplate 49 upon which the valve slides, this plate having alining 50',which form the fuel jets. Theoretically, it would be proper to have thevalve 34 be of such width that it could cover all and positively closeall the jets or nozzles at the same time. Practically, however, this isnot necessary and the valver34 may be reduced in width, quite as shownin the drawings, so as to eeonomize in metal and reduce the over-alldimension of the device. since those nozzles Awhich are uncovered tot-he right so remote from the aspiration and suction effects as limitedby the position of the valve that they will not respond. The position ofthe piston 34 determines the size of the active zone, that is. the zonesubject to the suction of the engine. scribed presently, the first one,two or three nozzles 50 are exposed to this active zone. The next three,four or five, or probably more, remote from the carbureting chamber, arepositively closed bythe valve 34 -while the remaining ones remote fromthe carbureting chamber are as much inactive as those positively closedbecause they are so far removed from the active zone, the zone to theright of the valve (Fig. l) being inactive or dead It will be seen thatthe main part'of the valve 34 fits down tightly upon the top of thenozzle block while a limited front part 51 tapers or converges towardthe carbureting chamber to leave a tapered space between that part ofthe piston and the top of the nozzle block as illustrated in Fig. l. lnthe drawings it has been necessary to exaggerate this taper somewhat inorder that the illustration might be clear. It will be seen that withthis construction of valve the main part of that 'member positivelycloses three, four or five or some other convenient number of nozzleswhile the tapered edge of the valve merely restricts the next one, twoor three nozzles, toward the carbureting chamber, the nearest of thesetoward `the carbureting chamber being the least restricted. Beyond that,toward the carbureting chamber, the nozzles are free and operi..v ItWill'thus be seen that provide an arrangement whereby of the valve (Fig.l) are As will be del there are first wide open nozzles, second, rer

stricted nozzles, or a series of increasingly restricted nozzles, andthird, positively closed nozzles. Regardless of the position of thevalve therewill always be these three sets of nozzles. lt will be seenthat as the valve 34 moves to the right (Fig. l), any restricted nozzlewill gradually become less and less restricted, by reason of the`gradually enlarging passageway at that point, due to the tapered partofthe valve, until -nally it is entirely exposed to the aspiration andsuction effects. Similarly, a closed nozzle is not immediately exposedto the active zone but it is gradually opened by the tapered part of thevalve. Thus, however slight may be the movement of the valve there is acorresponding and propor tioncd change in the amount of fuel passing byit. Since it is only the left hand side of the-valve (Fig. l) which isexposed to the lactive zone, the volume of air passing through the box3G and into the carburetng chamber is gradually changed, one way or theother. by means of the valve. There again, the slightest movement of thevalve results in an increase inthe amount of passing air and in this wayLmaintain a constant proportion between y the constituents of thecombustible mixture. In the' case of the fuel as in the case' of the airthe variations are infinitely small. thisl being made possible'by theoblique valve face. The operation is positive and reliable andsensitively accurate because the fuel nozzles are positively opened andclosed and the position of the valve always determines exactly thosenozzles from which there is to be a response. Since there is a responsefrom the restricted nozzles. the suction and aspiration effects whichmight tend to draw around the main part of the piston, unless thepressures are otherwise balanced. are satisfied in that way and therewill be no leaking froml the nozzles which are intended to bepositivellvfclosed. In' the drawing. the valve is shown in the startingposition and it will he seen that two of the nozzles are wide open.three are increasingly restricted. and the succeeding ones arepositively closed.

'The passagewavs 48. 48, which are vertical and parallel. are allconnected together at the bottom b v means of a horizontal passage 52which is alined with a passageway 53 in the wall of the box 36. Thispassageway communicates with a float .chamber 54 which is closed at thebottom by means of a base piece 55 to which a pipe 56, leading from thefuel supply, is connected.' The base piece is provided with a valve seat57 with which a valve 58 is associated. This valve, through theintervention of' lever mechanism 59, 59 is operatively connected with aoat 60. ln this Way the fuel is.

maintained at a denite heighein the' non;

, chamber and in theijuel. passageways 48, 48.

I claim as new and-desire to. secure by Letters Patent:

M size of said air inlet and progressively in# l'g-In a carbureter, acarbureting chamber,' an air inlet therefof1', 'f i plurality' of fuelinlets therefor and a singleftapered vaflye -for. (simultaneouslydetermining the ci'fejasin'gly restrictingla series of `said fuel vinlets land positively1 closing others.

av carbureter,` a 'carbureting Acharnber,l anx air inlet therefor,a'plurality offuel inlets therefor', and a single 'tapered valveresponsive to the suction ofthe engine for Vsimultaneously determiningthe Asize .of said* air inletjan'd progressively increasinglyrestricting a' 'series of said'fuel'inl'ets and'positively. closing'othersj i g3, Ina carbureten a. ber,',"a'1ifair inlet therefor, aplurality of-fu'el lioz'z'les-- therefor, a single tapered valve foi"carbnreting chaml 'simultaneously'determining the size of'said withsaid. valv .ar'inleband progressively restricting: some "f'fsaidv fuelnozzles and positively closing )i;lfiers, andav piston vresponsive tothesuction ofthe en gine .mechanically connected a carbureter, .a carlouretingV chainber, an inlet therefor, a row of fuel noztermin'ating'.in a single plane, -and a {ingle tapered'valve sliding upon said 'fuelnozzles,l forlrprogressively positively closing `someof said nozzles andrestricting others and-determining the size of the vair inlet.

' In a carbureter, a carbureting chambei", an 'air inlet therefor, a rowof fuely noz- ,zles terminating in a' single plane, 'and a .singletapered valve sliding upon saidfuel nozzles', for progressivelypositively closing soi'ne o f said nozzles and determining the .size ofthe air inlet, said'valve having a'part restricting other fuel nozzles.l

,;` 6. In al carbureter, a carbureting charnber, a cylindrical valveVchamber connectedl therewith, an air' opening extending substantiallythe length of sald Valve chamber,. 'a fuel nozzle block arranged in saidair opening, and a piston valve mounted in said valve chamber andsliding, upon the ton of tion. 1

said nozzle' block to positively close some of theznozzles, the part ofsaid piston toward' the 'carbu'retingrchamberY be'ii'ig tapered todiminishingly restrictl the adjoining fuel nozzles, saidA piston'. valvelalso determining the part of the air openingfinjcommunication'with thecarburetin'g chamber.

'7. In a carbureter, a carbureting chamber, .a cylindrical valve'chamber connectedl therewith, an air vopening extending substantiallythe length of'said valve chamber, a'fuel nozzleblock airranged in saidair opening-, a piston valveA mounted in said valve ,c'hainbelandjsliding upon thetop of said nozzleblock to positively close some `ofthe nozzles, the part'of 'said piston toward the l,lcxbureting chamberbeing tapered to dimin- 'shingly restrict' the adjoining, fuel nozzles,

f said piston valve also determininglthe partA of the air openingincommunication with lthe carbureting chamber, a second and largercylinder-'in alinement with saidvalve chamber,l and a piston in saidvcylinder mechanically. connected with said piston valve to form aslidingstructure responsive to sucl8. In a carbureter, ah carburetingchamber, 'avcylindrical valve chamber connected therewith,' an' airopening extending substantially the lengthl of said valve chamber,-

a fuel nozzle block arranged in said 'air opening, a piston valvemountedv in said valve chamberand slid-ingiu 0n the top of said nozzleblock topositi ely close some .of the nozzles, the part of said pistontoward the. carburetingl, chamber being tapered to diminishinglyrestrict the adjoiningy fuel:

ARTHUR H. BOE'FITCl-IER.-v Vitnesses: 1

HARVEY L. HANsoN.

LEONARD E. BOGUF..

